Brake mechanism.



G. A. TERRY, DEOD.

E. J. TERRY, ADMINISTRATRIX.

BRAKE MECHANISM.

APPLICATION FILED OCT. 23, 1909.

Patented Mar. 31, 1914 MI H INflVENTOR fiz/ATT fiNEYS COLUMBIA PLANOGRAPH 60., WASHINGTON. D. c

earns PATENT OFFIC COLEMAN ARTHUR TERRY, DECEASED, LATE OF NEW YORK, N. Y., BY EMMA J. TERRY, ADMINISTRATRIX, ASSIGNOR T0 TERRY CORE DRILL COMPANY, A GOR- BRAKE MECHANISM.

To all whom it may concern Be it known that COLEMAN ARTHUR TERRY, deceased, formerly a citizen of the United States, and a resident of the city of New York, borough of Manhattan, county and State of New York, did, prior to his decease, invent certain new and useful Improvements in Brake Mechanism, of which the following is a specification, reference being had to the accompanying drawings, forming a part thereof. I

The invention relates to brake mechanism of the hand brake type and consists in certain details of construction and combinations of parts such as will be fully pointed out hereinafter, and for the further understanding of the invention, an embodiment thereof is illustrated in the accompanying drawings, and will now be specifically described, the novel features being thereafter pointed out in claims.

In the drawings: Figure 1 is a view in partial end elevation and partial section of a hoisting machine in which brake mechanism is employed constructed in accordance with this invention. Fig. 2 is a view in side elevation thereof.

The hoisting machine comprises, in general, a drive shaft 5, a hoisting drum 6, gearing 7 between the drive shaft and the hoisting drum, and a clutch 8 for operatively connecting and disconnecting the drive shaft and drum through the said gearing. The shaft, gearing and drum are suitably mounted in a framework 9. Connected to the winding drum 6 is a brake wheel 10 upon which is disposed a brake band 11. One end of the said brake band is secured to a connecting element 12, the other end of the said connecting element being secured to, or constructed as a part of, an eccentric strap 13. The said strap is mounted upon an eccentric 1-1 disposed upon an operating shaft 15 located transversely beneath the drive shaft 5 and suitably journaled in the frame work 9 of the machine. The opposite end of the brake strap is secured to a shoe 16, the said shoe having a curved surface concentric with the surface of the wheel 10. The said shoe is provided with a boss or hub 17 in which is provided a conical recess 18. This conical recess is arranged to receive the pointed end of an element 19, the opposite end of which is secured to or formed as a Specification of Letters Patent.

Application filed October 23, 1909.

Patented Mar. 31, 1914.

Serial No. 524,206.

part of an eccentric strap 20. The latter sa1d strap is disposed upon a second eccentric 21 also mounted upon the said operating shaft 15. The two said eccentrics 15 and 21 are oppositely disposed upon the shaft 15, that is to say, they are disposed angularly at 180 apart, whereby upon rotary movements being imparted to the shaft 15, one of the said eccentrics will be moved downward, while the other will be moved up ward. The connecting element 12 is a tension element, while the connecting element 19 is a compression element, and an operative movement of rotation of the shaft 15 in the direction of the arrow, Fig. 2, will move the eccentric 14 downward so as to exert tension upon the element 12, and hence upon one end of the brake band, while at the same time it will move the eccentric 21 upward to exert pressure through the member 18 to the brake shoe 16 whereby a tension in the opposite direction will be exerted upon the other end of the brake band. By this arrangement, a powerful braking action will be applied to the brake band with a minimum expenditure of force upon the shaft 15. The shaft 15 is provided with an operating handle or lever 22 by which operative movements of rotation may be readily imparted thereto.

The element 12 is preferably made in two parts which are oppositely threaded and engaged by an adjusting nut 23 by means of which adjustments may be made to take up any stretch of the brake band 11 and whereby the parts may be initially adjusted so as to properly position the lever 22. The conical recess 18 combined with the pointed end of the compression connecting element 19 permits a certain amount of play between these parts without causing them to become cramped, and by this means, less accuracy of adjustment is required and a greater efficiency of operation in insured. It will be noted that by this arrangement almost the entire surface of the brake wheel is available for braking purposes, the band also entirely encircling the said wheel.

The following is claimed:

1. Brake mechanism comprising a rotary brake wheel, a band thereon, a pair of oppositely disposed eccentrics having a common axis of rotation substantially parallel to the plane of the wheel, a tension rod connecting one end of said band with one of the eccentrics, a brake shoe reinforcing the other end of said band, the lower portion of said shoe being constructed to form a pocket, a compression rod, extending from the other eccentric into said tating said eccentrics together. 7

2. Brake mechanism comprisinga rotary brake wheel, a band thereon, an, actuating shaft substantially parallel to the plane of the Wheel, a pair of oppositely disposed eccentrics thereon, a tension rod connecting one end of said band with one of the eccentries, a brake shoe at the other end of said band, the lower portion of said shoe being constructed to form a conical pocket, a compression rodhaving a pointed end, said rod extending from the other eccentric into said pocket, and a lever for rotating the shaft.

, 3. Brake mechanism comprising a rotary brake wheel, a band thereon, an actuating shaft substantially parallel to the plane of ocket, and means for r0 said rod extending from the other eccentric into said pocket, the pointed end of said compression rod forming a loose connection between said rod and the shoe end of the brake band, and a lever for rotating the shaft.

Witness my hand this 30 day of Sept, 1909.

EMMA J. TERRY,

Ad lm'm'stmt'rw.

WVitnesses:

C. M. TAMBAUGH, H. G. PARK.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner oi Patent: Washington, D. C. 

